Before this change we could crash in Debug when WebRTC audio was first interrupted and then resumed again. The reason was that the new audio stream stems from a new native I/O thread and that triggered thread checkers. With this change, failing thread checkers are detached when audio is interrupted to ensure that they don't fail when audio is restarted. NOTRY=TRUE Bug: webrtc:8126 Change-Id: Ib36ff6bc942477730aba60066f049ed0c43d3901 Reviewed-on: https://chromium-review.googlesource.com/628716 Commit-Queue: Henrik Andreasson <henrika@webrtc.org> Reviewed-by: Per Åhgren <peah@webrtc.org> Cr-Commit-Position: refs/heads/master@{#19465}